Improvement in bits for rock-drilling



JL B. WARING.

BH Fon ROCK DRILLING. "N,172,529. mtentea :an.18,187e.

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UNITED S'rA'rEs PATEN'I' OFFICEa JOHN B. WARING, OF NEW YORK, N. Y.

IMPROVEMENT IN BlTS FOR RCK'DRILLING.

Specification forming part of Letters Patent No. 172,529, dated January 18, 1876; application filed January 23, 1875.

To all whom lit may concer'n Be it known that I` JOHN B. WARING, of the city, county, and State of New York, have invented an Improved Bit for Rock-Drilling,

of which the following` is a specification:

The object of my invention is to construct an efiicient drill-bit for drilling enlarged holes in rocks, for the reception of the explosive ,material for blasting purnoses, and this ob- J ment of the explosive material.

I make the drill-bitin the manner shown in the enlarged views, Figures 2, 3, 4, and 5, Fig. 2 being' a side view; Fig. 3. a view of the front edge; Fig. 4, a view of the rear edge, and Fig. 5 an inverted plan view of the cutting-hase. w

This bit consists of a rod of steel, in the present instance of oetangular sectional form, and the lower portion of this rod is flattened and reduced to the shape shown in the drawmg.

On the inclined Cutting base a are formed a number of V-shaped ribs, which are made tapering from the broad front edge m of the bit to the narrower rear edge a. i

ln the present instance there are four of these ribs, but their number-and size will depend in a great measure on the character of the rock to be drilled.

In the front edge m of the bit there are as many ribs as on the base, (see Fig. 3,) and these rihs coincide with and meet those of the base at the Cutting-edge b, where 'they form sharp Cutting-points.

I claim as my invention- A rock-drilling bit, having on its inclined base a number of cutting-ribs terminating in corresponding ribs on the Cutting-edge b, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

J. B. WARING.

Witnesses:

HUBERT HoWsoN., HARRY SMITH. 

